The board features look somewhat similar to NFC tags sold for 50 cents online, but it does come with more memory (256 bytes vs 144 bytes), has a longer claimed retention period (200 years vs 10 years), supports password protected, adds GPO output to interface with external hardware, and STMicro provides hardware design files, documentation, and Android app source code directly on the product page.

You can purchase the board for $4.9 directly from STMicro directly via the product page, or search for CLOUDST25TA02K-P order code to buy from distributors such as Digikey.